Multistage pump for producing a vacuum or compressing gases.



cylinder 4 of the low-pressure stage.

i and working at a hlgher ressure.- This pis- A that passes through a stuffing box 20 in .the

2;2'gdijven by fa shaft 23 from an suitable .5551

UNITED OFFICE.

AUGUST SIEGEL, OF BERLIN, GEHMANY, ASSIGNO1{ TO GENERAL ELECTRIC COMPANY, A CORPORATION 0F NEW YORK.

MLTISTAGE PUMP FOR RODUCING A VACUUM OR COMPRESSING GASES.

Specification of Letters Patent.

Patented Sept. 1, 1908,

Application filed December 26. 1907. Serial No. 408,056.

To all whom it may concern:

Beit known that l, AUGUST Simoni., a sub- 'ect-ofthe King of W rtemberg and of the llmperor of- Gerinany, residing at Berlin, Germany, have invented certain new and useful Improvements in Multistage Pumps for Producing a Vacuum or Conipressing Gases, of which the following is a specification.

The present invention has for its object to provide a multi-stage pump which will eiliciently extract air from a condenser or compress gases.

In the accompanying drawing is illustrated one of the embodiments of my invention inv vertical section.

1 indicates the casing of the pumlp which is rovided with a cover or head 2. he casing 1s provided with an internal flange or shoulder 3 to receive and support the flanged englpf e cylinder is provided with one or more ports or slots 5 which admit air and water to the cylinder space wxl-"the pump is connected to a condenser. he cylinder being smaller than the casing, air and water can freely circulate around the cylinder in the annular chamber 6 and enter the ports when uncovered by the piston. The cylinder is provided with a head 7 which is fastened to the flange thereof and is provided with pressure-actuated outlet valves 8. Air and Water enter the chamber 6 from the inlet conduit 9 connected to thc'hot-well of the surface condenser, or other apparatus 10. Mounted within. the cylinder is a piston 11 having a rod l2 extending through the head 7. The casing is also provided with an internal flange or shoulder 13 u )on which is seated a partition 14 that divides the upper part of the casing into Vintern'iediate au discharge chambers 15 and 16. The partition also carries the open-ended cylinder 17 having one or moreiinlet ports or slots 18. Located within the cylinder and mounted on the piston rod 12 is a piston 19 smaller than the piston 11 ton is 'provided with a tu u lar guide or trunk head 2 of the casing. The pistons are connected to the-connecting rod 21, shown to slmplif the .illustra/tion as a broken and dotted "n'e. @The rod is connected to a crank douiw'fbfpower. .The discharge c amber 16 is provided with an outlet conduit 24 (-onnected to any desired receptacle by the usuul piping.

ln the present illustration a pump having two stages hns been shown and connected in ywhic it flows through the ports or slots 5 into the space above the piston l l. As the piston moves upward the ports 5 are closed )y it, and. lthe air in the cylinder is conipressed, the outlet Valves 8 temporarily re-l maining closed until the pressure 1n the intermediate chamber is reduced. As thc piston 11 moves upward so does the upper piston Just as soon as the upper piston closes the ports 18, the pressure in the internmdiatc chamber 15 decreases and continues to do so until it has fallen to the saine vaille or slightly below that in the lower cylinder space. At or about this instant the outlet 'valves 8 open and air and water from the lower cylinder pass through them into thc intermediate chamber. In the meanwhiie the upper piston 19 has forced air and water which it escapes by the conduit 24.

When the upper piston reverses its movement and starts to move downward it comresses the mixture of air and water in the intermediate chamber 15 until the ports or slots 18 are again uncovered. AAs soon as the orts` are uncovered, the piston continuing its movement, air and water pass'into the pressure or discharge chamber 16, the pressure and intermediate chambers being at this portion of the cycle of operation in di- 9 rect communication. l/Vhile this part of the cycle is being performed the lower piston creates a vacuum in lthe low-pressure cylinder up to or substantially up to thc lower end of its stroke when the operation is re ieated.

1t will be noted that only one set o valves is required for a two-stage compression and owing to their arrangement they open very easily and the wear thereon is reduced to a minimum. Owing to these facts the speed of the pump can be high which is a material advantage.

into the upper pressure chamber 16 from In case a greater pressure than atmosphere is to be overcome the invention can be carrled out as a double acting pump with the displacing device oi" the. high. pressure stage formed us u differential piston und the introduction of e compressed nir vessel. This nrrfingcment is particularly advantageous with higlrspccd pumps.

In accordance with the provisions el" the 'partent statutes, l ha ve described` the principle ol" operation of my invention, together with the apparatus which l now consider to rcpresexllmthe best embodiment thereof, but l desire. to huye it understood that the zipperartus shown is only illustrative, und that the invention cu-n be carried out by other menus.

W'hnt ll claim ns new, und desire to secure by Letters Patent ot the lhiitecl States, isf- 1. An apparatus et the,v character described, comprisiiner :L piston and cylinder, the letter containing mi inlet port or slot `controlled by the piston, :in inlet for the cylinder, :in outlet vulve., a, second piston und c lindor, the lutter beingprovided with un in et port controlled by the piston, e chamber which receives the tluid direct-ly from the second cylinder, und is zilwnys in uninterrupted communicution therewith, und an' outlet.

2.-An uppzuutus 4of the character described, romprlsing a1- piston end cylinder,

thc hitler buying u. port controlled by the piston, :i elnuubcr communicating with the source of supply und the port, it 'vulve-conM trolled outlet, n secondvpistou and cylinder, the lutter huving :in inlet port controlled by the piston, un intermediate chzunber communica( ing with seid vulve-controlled outlet und the: inlet port of the second cylinder, a

discharge clnunber in unrestricted communi* cation with the second cylinder, und an outlet for the dischargel chamber.

3. An apparatus of the l character described, the combination. of s fusing, a ported cylinder sup orted therein and seperated from the wel by n supply chamber, e pertition which divides the casing into intermediutc und discharge chambers, e ported cylinder supported by the partition, pistons.

which move. in the cylinders und control the ports, u pressurcscontrolled vulve between the spec-e ol the first mentioned cylinder und the intermei'liutc chamber, nn inlet for v,the supply chamber, and. im outlet for the discharge chamber.

4. 1n un apparatus of the cheracter dc-` scribed, the combina-tion 0f u piston and 'rylinder, n port in the c linder controlled by the' piston, e supply c nimber communicating with .the port, urn intermediate pressure chamber, e valve controllin the passage of fluid from the cylinder to ti which is held on its seat by the pressure in the chamber s0 long as it is superior to that in the cylinder, n second piston and cylinder, e port for the latter controlled by the piston sind communicating with the intermediate chamber, u discharge chamber in unrestricted communication with the second cylinder, sind im outlet for'the discharge-chamber.

ln witness whereof, I have .hereunto set' my hand this tenth day-of December, 1907:'

A UeusrjsnsGEL.v

Witnesses:

J ULIUs ,RUMLANIL KARL MICKEBEN. I p

e' chamber and' 

